Prism Sums

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Prism Sums

Split the sunbeam into a rainbow with quick sums. Split a beam of sunlight into a rainbow with quick mental math starring pixel Isaac Newton. Solve sums before each countdown runs out, build a streak and light up all seven colours in this free math game.

Twist: A finished sum appears, like 7 × 8 = 54, and you decide whether it is TRUE or FALSE.

Parody. Isaac Newton has no involvement in making these games and does not endorse them. The character is an original pixel-art caricature.

How to play

Each question is already solved: you see a full sum such as 7 × 8 = 54, and you choose TRUE if it is right or FALSE if it is wrong.
Tip: about half the sums are true. Work out the answer yourself first instead of trusting the number that is shown.
Every right call adds a colour to the rainbow. Quick calls score more, and a streak of them multiplies your points.
One wrong call, or letting the timer bar run out, clouds the prism and ends the round. The sums become times tables and two-digit numbers as you go.
Tap or press Space to start, then tap TRUE or FALSE, or press 1 for TRUE and 2 for FALSE. Light up all seven colours for a full rainbow.
Pause with P or Esc, switch sound with M, and share your score when the light fades.

Top 10 high scores

No scores yet: play a round and be the first on the board!

All-time top 10 scores in Prism Sums
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The story

Pixel Isaac Newton has closed every shutter in his room except for one tiny hole, and a single beam of sunlight now shines through the dark onto a glass prism. He is sure that white light hides every colour of the rainbow. All he has to do is prove it with a round of Prism Sums before the sun moves on.

Every correct answer coaxes a new colour out of the prism, every streak makes the rainbow glow brighter and a single wrong answer clouds the glass. Light up all seven colours and the whole room fills with a rainbow. Stop short, and the sunbeam will have to wait for another clear day.